Method of manufacturing sound-record tablets.



J. SANDERS.

METHDD OF MANUFACTURWG SOUND RECORD TABLETS.

:.PPLICMIGN msn me. Si, 190s,-

Tneuted Juy 25, 1916.

JOSEPH SANDERS, 0F WASHNGTON, DISTRICT 0F COLUMBIA.

METHOD OF MANUFACTLBING SOUND-RECORD TABLE-TS.

Specification of Letters Patent.

Patented July es, isi-s.

Application led January 11, 1908. Serial No. 410,456.

To all whom 'it lmay concern:

Be it known that I, J osnri-I SANDERS a citizen of the UnitedStates, residing atvllVashington, District of Columbia have invented a new and useful Method of Manufacturing Sexual-Record Tablets, of which the following is a specification.

This invention has reference to improvements in the method of nmnufacturing sound record tablets, the term tablets heilig used in this connection to include eithera tablet before the sound record groove is impressed therein or the finished tablet with the groove impressedA therein.

The sound record tablet hereinafter described is not herein claimed since it forms the subject matter of and is claimed in another application filed by me on April 29, 1908, under Serial No. .429,931, for sound record tablets, as a 'division of this applicai tion.

At the present time the principal'ty e of sound record tablets is the disk shape tablets, and these are commonly made of a mixture of shellac and other materials, including fibrous material, usually cotton fiber cut into short lengths and known as cotton flock. The usual practice of making sound record tablets is to take a mixture o such materials with the ingredients already incorporated, and soften the same by heat and then 'impress a sound record groove from a matrix of the same into the heated and thereby softened material, the heat and pressure being sullicicnt to produce a faithful copy of the matrix into the heated material which is pressed out into the form of a disk of appropriate size and is allowed to cool and set under pressure. Such sound record tablets with the sound groove impressed therein have become known, commonly, as sound records and are also known by various trade names, but for reasons which need not be here stated, I prefer to designate the type of record tablets described as a gramophone sound record, and thematerial as gramophone record material. Among other ramophone record materials that descri ed in Letters Patent No. 787,001, granted to me on April 1l, 1905, under the title 0"Com position of matter for sound record tablets, is particularly adapted for use in the present invention. Furthermore the type of tablet described in Letters Patent No.

-Y 956,904, for sound record tablets, granted to me on May 3, 1910, is a type of tablet to which the present invention is particularly appllcable. However the surfacing material applied 1n the manner described 1n said Letters Patent last named is not perfectly adapted to all conditions.

The ordinary gramophone sound record roove is about 1/250'of an inch, more or ess, in width, and of commensurate depth, being'sometimes as shallow as 1/500 of an inch and'at other times deeper in accordance with the desires of the recording expert. Some experts use very deep and wide grooves compa-red with those used by others. The standard pitch of the spiral on which the groove is produced is approximately one hundred turns to the inch. The result is that while a 'comparatively narrow, shallow groove has at all times comparatively wide plateaus between the turns even when the turns are closest due to the sinuosities of the groove representing sound waves, a deep and wide groove will at times produce narrow plateaus between closely approaching turns and oftentimes the walls of a groove are uite thin for a considerable distance into (the face of the tablet.

A. shellac containin gramophono record material where the she lac is associated with oxid of iron or some other like material is quite brittle when flock is omitted for reasons which will hereinafter appear and the thin walls between two turns of deep grooves are unable to resist the lateral thrust or strain due to the guiding of the stylus and the parts controlled thereby and these walls often break down under such thrust or strain, the walls where merging into the plateaus being shattered or chipped away and the record becomes defective for reproduction to a commensurate extent.

It is one of the objects of the present invcntion to overcome this defect without sacA rificing any of the advantages inherent in a record disk comprising a basic structure of material other than that used for the record receiving surface and this Objectis realized by incorporating in the surfacing of record material a suitable quantity of fibrous material which will serve ,to very markedly chipping or shattering or breaking down of the walls of the groove 1n the manner and under the conditions stated.

In the aforesaid Patent No. 956904, the, surfacing material is applied in liquid form,

that is the shellac is dissolved and the other materials are held in suspension in the soluof the record material tien, but the presence of fibrous material renf ders 1t difficult to produce an even coating, even though the fibrous material be cut very fine, the fiber absorbing much of the solvent. .It is therefore not an uncommon practice 1n making'up tablets in the manner set forth in the said Letters Patent to omit the flock from the surface layer. Furthermore when the surface layer is deposited from an emulsion and this layer is made fairly heavy the quick exterior drying of the material retards the drying out of the remainder for a comparatively long time, or several thin coats must be applied to gct the requisite thickness of the surfacing.

rlhe reduction of a surface coating of the desired record material of the requisite thickness 'but which shall be quick dryin and which can be applied without additiona handling constitutes another part of the present invention and consists in applying to the matrix structure a cementing material to which the final coating in powdered form is applied, the solvent of the material, when such solvent is employed quickly evaporating because of the large exposed surface.

The usual method of manufacturing the record material by softening the shellac and then mixing therewith the other ingredients does not cause the infiltration of the fibers fibrous material by the shellac. Therefore the material is more or less hytafroscopic and many such records become d efective in damp climates, particularly 1n warm moist climates.

To obviate this defect constitutes a still further object of the present invention and this is done by applying an additional coating of a thin solution or emulsion of the from which flock has been omitted. By this means the fibrous material of the record surface has its fibers encapsuled in the non-fibrous record material and they are thereby either so infiltrated with the record material or so protected thereby as to be unaffected by moisture even when subjected to the effects of moist torrid climates such as are sometimes encountered in the tropics.

The invention will be best understood from a consideration of the following detail description taken in connection with the accompanying drawings forming a part of this specification, in which drawings,-

Figure l'is a partially schematic section of a small portion of a sound record of the gramophone or disk type, showing the comparatively shallowY form of record groove. Fig. 2 is a similar view showing the deeper and wider form of record groove. Fi 8 is a schematic sectional view of a ta let made in accordance with the present invention and illustrating one phase of the process of manufacture. F 1g. 4 1s a similar view to Fig. 3 to illustrate a more advanced step in the manufacture. Fig. 5 is a. schematic sectional view of a portion of a record tablet made in accordance with the present invention and indicating a sound record imressed therein. Fig. 6 is a diagram indicatlng consecutive steps in the manufacture of a sound record in accordance with the present invention, and Fig. 7 is a like diagram showing some variations of the steps in the manufacture from that shown in Fig. (3.

Referring to Figs. l and 2, there is shown a base 1 and a surfacing 2. The proportions of these two parts are of course' greatly exaggerated since the entire tablet need not exceed about one-eighth of an inch in thickness and thc surfacing material may be one one-hundredth of an inch or less in thick ness` and under some corcumstanees may be considerably less than one one-luindredth off an inch in thickness. The basic material is preferably, though not necessarily, made of cardboard or pasteboard or other cheap fibrous material which, for reasons which need not be entered into here, but which are fully disclosed in my aforesaid application, is sized with resin or other like material, but preferably a material which will soften under heat and which is hard and firm when cold. Nor is it necessary for the purposes of the present invention that the base or understructure be made of a single disk, as for instance a disk of cardboard made of macerated fibrous material, but may be made up of a number of sheets of fibrous material as is present in laminated cardboard, or the base may be made of a disk of cardboard preferably suitably sized upon which is secured a thin disk of paper carrying the record material. This last-named structure and its purposes and advantages are set forth in my application #239,961, filed Jan uary 6, 1905, for gramaphone record tablets. It need only be stated here that the interposed sheet of paper between the record-rm ceivin material and the base facilitates the manu aeture and also aids in preventing any admixture of materials used in the base with the record-receiving material where the materials contained in the base or some of' them are detrimental to the said record-rmreivine, material. This extra sheet of paper is in dicated by the reference numeral 3 in Fig. FS. In Fig. 1 there are shown two adjaraint grooves 4, 4. and these may be taken as '1ndicative of the more shallow type of gramophone or disk record grooves where the normal separation of the turns of the spiral constituting the record groove is approximately one one-hundredth of an inch, while the width of the grooves themselves is considerably less, say, approximately one twohundred and fiftieth of an inch, and the depth, say, one five-hundredth of an inch more or less. These figures are of course to be taken only as approximate. ln such comlll() insane-r paratively narrow and shallow grooves 'the intervening plateau 5 is of considerable Width and the thickness of material between adjacent spirals of they groove is well able to Tvithstand the side thrust of a 'reproducing stylus when being actuated by the record groove and constrained to follow the sinuosities representing sound wares, even when the sinuosities of one member of the spiral groove are in the opposite sense to the sinuosit'ies of the next adjacent meml er of Athe spiral groove, as will sometimes happen, for even then the plateau is of considerable Width and the walls of the groove approach the same at such an obtuse angle that the intervening recordv material between two even closely approaching` adjacent members of thegroove is still'of such thickness as'to well withstand the thrust of the stylus However, it is the custom ol. some. recording experts to Jform the record grooves much deeper and Wider than those indicated in. Fig. l, and. such deep wide' record grooves are indicated at G, 6, in Fig. 2. 1With such grooves the plateaus are normally narrower than the normal plateau of the tablet of Fig. l, and .vnen the sinuosities of the adjacent spiral members are in opposite sense, as they etten are, so that a particular portion of the groove in one spiral member is brought into 'very close relationl to' a particular portion of the groove of the other spiral member, then the intervening plateau is reduced to very narroiv limits and the steepness of the Walls of the groove leave much less record 'material bet'af'een the two adjacent positions of the spiral members of the groove than lunder the conditions oit Fig. l. The result is that. a brittle record material Without the presence of flock or other strengthening' liber, is unable to withstand the thrust of the reprorlucing;` stylus and pieces of the intervening record material between the -Walls of the adjacent portions of thcgrrooves are shattered and broken away, as roughly indicated at 7 in Fig. 2, thus mai-ring the reproducing qualities of the record tablet and sometimes destroying its usefulness for further reproduction.

Gramophone or disk record materials made of shcllac and other ingredients are too brittle to be rolled out into 'very thin sheets tor application to the brous or other base, and consequently can only be economically applied to such base either in the manner hereinafter described or when the shellac dissolved in a suitable solvent, and the other inaterials are held in suspension in the shellac solution so as to form what may termed an emulsion of the gramophone or disk record material. Such emulsion is readily applied by a brush or by dipping the basic disk or paper vehicle therein. lloivever, the presence ot dock renders it very dilllcult to produce from an emulsion 'an eten .layer with the materials properly distributed and a surface Vcoating so formed is comparatively slou7 drying because, among other reasons, thev dock absorbs a material portion oit' the solvent, as before stated. So Where the shallow grooves are used the surface layer of record Vmaterial is made of shellac Aand oXid of iron or some similar material .Without the admixture of flock.

The flock, which term may be taken as descriptive of any suitable fibrous material in a suitablyv finely cut state is added to the surface material composed of .shellac `and other ingredients, while it is in the torni of a thin solution or emulsion which is'coated upon the basic disk or-upon the paper vchicle by means of a brush or by dipping or in any other suitable manner, thus producing a thin coatiimf of the record material.

In Figs. G and 7 there is displayed schelmatically the several steps in the production ot' a record tablet blank in accordance with thepresent invention. vand in this schematic representation the first step in the process is the preparation or" the basic disk which may, for the purposes ot the invention, be considered as either a disk l of cardboard or pasteboard or` similar material which preferably is impregnated with a sizing such rosin or other material capable of softening when heated and which is hard and resisting when in a cold state. This sizing may or may not extend entirely through the disk but should extend toa 'sufficient distance into the disk from the surface thereof to maintain the fibers ot the disk when they are compacted under the pressure necessary for the impress oit the sound record groove, in such compressed State, by cementingV such fibers together and preventing' them from aga-in. expanding to their original"condition when the pressure is relieved, thus preventing distortions and irregularities or other defects from beingr formed in the record-receiving sui-face.

ln Figs. (3 and 7, such basic disk, whether formed of a suitably sized cardboard disk or ay cardboard disk with a paper facing, or however formed, is indicated by the rectangle 8, and following this is another rectangle il which represents the step of coating the basic disk with a thin solution or emulsion of the record material, or as will hereinafter appear in connection with the method of constructing the tablet blank displayed inflfig. this second step may consist in the application of shellac alone or some other like material.

Referringr now to Fig. 7 only, in conjunction with Figs. 3 and 4, the rectangle 10 indicates a step' which may follow the coatingr ot' the diskwith the thin solution or emulsion of record material. According to one method of procedure, a thin sheet ot' fibrous material, such for instance, as cotton batnecessary body o fre irg, may lue lnicl vapor ormed of 3, the eoai elution of recel-leo... i. wir elie fibrous incliiuefl :r il

ons meen of l l.' te'inl will ale up the .fg-realer porl'i the wel, Coul/mg by absorption,

and

i adige emulsion of l.; th@ -l in or le Elo i mleriel llere Solution or es indicated. E, 21ml folowiegg this the fm Mlcl'i emulsion l); 'he resem.. disk muy be flrleal. which loef: sie? cated by lie reotzmgle 14.

. liieieafl of using o Sheet of fibrous maeriul lle loler may oe auf. up inte 'very short lengths ariel alien (lepo l i 'lle wel; coming., :unil this step iumenerl by' lie rectangle l5.. After liis there .may be ailother coating oil? o solution or emulsion of reeorcl material, as indicate-1, by the rectangle 16,.:111d may be followed by r;l r l...j f, ne incli- Cned loy the re ongle 1'?.

Coating, the Desio disk, zifer being coated with e thin solution or emulsion of record material, may be ippecl ino e muss i out fibrous maerlel, which Siep ie i by the reeaigle 1S, 2mal tlie may a receive im additional coating of :i solution or emulsion of record; mar'aei A, es iodicfele. L lie reemigle 19 lio be followed by elle ally* ing inelioirtecl' by ''.he reczmgle 2G. Jin alle first of Jalle Ways of applying che ibrous material described wvitlig'eferenee to the representation of Fig 7. lilleof fibrous me 'lieriul will adhere to the wei eo: ingr :mtl 'lle amount of fibrous material is flelermiloed solely by lie tliielfn'iess off' suoli sliee le the Ease of depositing' :line fibrous mmberiel on lie wet coating; there moy `foe more de pose/l than is ixeeilefl, and 'lle l," n'izljff' be jnrrefl of?? since enough et? meerial Will adhere lio lie wel e i. the purposes of the nvension. ln elle eoee of dipping she eoaed disk im@ a mese o 'the fibrous material, the latter 'will adhere in suliicient quantities to the surface of the disk and 'what fails 'to adhere will grau-diete oil bhe disk or may be jarrefl oil'. i'

. llo. Whatever mannerlhe fibrous weiser-inl is caused 'to adhere to lle surface oi the disk with ,ie initial coating of .fz Soluion or einul- Sion recorclnuerial. el when bhe e y-lOe allowed to .(lry.

terug ac'lnozi of me repru tlv-1e @lee/p and wide reooro shown at i in Fig. Bere ir reeord surface.

lo Fig. f3, here iel'iod of produoili.Y

:i basic (lieky :refered for "ale i from :i groove inipre @n .D matrix, lfi'e cleejo am Successful-ly resist the zie-Lion of aiming stylus oi 'the gremophoue producing* machine. lfm Ll-ie pro l y .v 1. if 1 N.. A* V17 played 1.a lug. o, elle oeeie elisir. f, as before 2mal is preferably oracle a boargl or posteloorfl. or some such ma. Wih e sizing@ of roem or other slum',

@le mm geridl `li'or @he f uorpose.. aofl with, er vf El? interposed sheet 3 oil "Uno elisir is: u'oflueed soliti# j or emulsion or record mi.. even.1 'under Some eircom e footing of sliellae only, iuloase 'lie l ing elemeirb of the record material e other substance *than elielleo eoezirigr muy or may i pending upon the Milenio; re or f' mzlerial usecl.

u the method (lispl third Step reprosenfae. by the elil'ere s mevvhet from lie correspon siepe in the methode represeL Lecl iii Fig. lzior this. third step the re-eorl meterla-l is eomposel of slmllao, oficl or iron or other similar and suitable m eriels' and fibrous; n :ferie-l provicledin e powdered stelle 0E sfullieien; iinenese for the ooge, and "lle basic disk Wil/li its coating of .L thin sol'L time.

f 'll' Ariat or emulsion of recorfl or meer lie whilesill wel; is clipped in or upon it the powdered rie l il; all the elemenl's of reeorfl Mietern) e epfl the surplus; may

be allowed. o grzwitete or lle ziried ofi'` :mal l the disk .eo eozecl may llllieri suce n. diss: r the regloslte degree to afterward heated to o Sorten the record maerinl and the tablet s'lllijected tolie pressure oi the imrizi, "Ehen lie surfacing of reeorfl in .comparatively long` time.

the point of the stylus of the reproducing machine the sanie as though a suiiiciently thick coating of the record material had heen originally' produced upoii 'the surface of the disk directly from a solution or emul of the record material. But a decided advantage arises' from the production of the record-receiving surface in the manner just described, for the reason thatthe record material is composed or' a binding materiali\ such as shellac, a hardening material suchoxid of iron or similar' substance, and a strengthening material such as flock or other fibrous substance, thus permitting the production in such surface of a sound record groove ci comparatively great width and depth with the separating Walls so strong as to resist the action of a pointed stylus,even 'though these walls he comparatively thin.

Amore, the production of a surface ole for receiving the record .impressions iecty from a solution or emulsion of the i VWrd material aside from the diliculty of producing a record surface containing tinck or other such strengthening element, is necessarily a slow process, since, if a sutilciently thick coating he initially produced then the surface evaporation of the solvent forms a skin layer vwhich retards the drying of the deeper portions oi the coating for a Or, if this be avoided by usingseveral thin coatings to build up a coating or, su'iiicient thickness, 'then there is the atteridant multiplicity of 'am ling" and; the time taken in drying, 'ciradds rei-y rfiaterially to the exoense iroducing these tablets.

By the use of ay thin initial coating and then aijiplying the fibrous material thereto, or hy appl: the complete record matell to this thin coating` while the said reciaterial is in a powdered state, the dryfly facilitated'because oi the ab- 4the iilu'ous material or into the il: -i

sorption powdered record inateriai of the initial coatwhcrei'iy the exposed surface of the latto the evaporatiorr or" the solvent is Qreatiy enlarged and the drying proceeds f n.. Very rapid rute. Moreover, but a s mil ious effects oi' the solvent onthe sliellao is thereby minimized or entirely avoided,

in. 'the process indicated in Vig. 3 another step n'iay follow 'the alu'ilication of the povpd complete record material, and this in the application oi? another coatnfg of a thin solution or eznuision of record nuterieL indicated hy the rectangle 22 to be ollowed'hy the dryiuvr oi' the tfahletiudiy tlie'rrctangle s of forming the record he line? coating may lic of a thin so, ul 'or emulsion of toe record material t the fibrous material, or in the pau rtli, this coating conce set if ount of solvent is necessary, and any ilcll si protected against the nioisture,.is liable iov ahsorh suliicient moisture to spoil the iinished record tablet for the reproduction of sound, when the sound groove is impressed therein, because of the presence of the contained moisture, which softens 'the surface of the tablet so that it is no longer resistant to the point oi the stylus to the extent neces for tablets of this character.

in Fie. is shown a portion oi' a record disk constructed in accordance with the present invention, but with the. proportions greatly exaggerated, ln this gure the record grooves are indicated at 242, while the record receiving material is indicated at 25 very much thicker than the paper-layer 3, lout this is done only for clearness of illustration, while in 'practice this layer need not be thicker than one one-hundredth of an inch and may actually be considerably thinner.

The sizing in the basic disk l is indicated in the several figures by shading 26 which is not intended to illustrate the .actual conditions present in the disk lout simply to indi-- cate the inliltration' of the sizing into the disk, it being understood that the sizing may extend entirely through 'the disk or may. he denser at the surface Within the disk or may under sonic circumstances extend hut partially through the disk, only being necessary that the niliersof the disk he Sudiciently anchored hy the sizing to prevent the swell ol? the disk aji'ter having once been suhjected to the pressure used igor producing the sound grooves in the surfacing oit recordreceiving material. The sizing also prevents absorption of therecord-receiving material into the uudcrstructure.

To give a specific example, the present invention may he successfully carried outoy the use cfa pastelioard or cardboard disk of suitable thickness with a suitable sizing such asrosin, and upon this sized hase the coating of a thin solution emulsion of shellac and. oXid of iron may he produced. either directly or upon a paper disk, which in turn is applied to the sized cardboard disk. Then upon this coating` while the latter is still wet, there may he produced another coating' made up o i1 a powdery mixture of sliellac, oxid oi" iron and iiocir say cotton iloclg in proper proportions such set forti; in my liettersiatent :rZS/i before rc ierred to, and tl, Lcord maies ...he mats/rmi 1.-(5111 m.' other mmh .v

'1 the nnfi'termljxns 70 and. :zdf

a of:

when:

Het may be.

Maly' 110th m (1s-)amm sur -11 Merial ma,

:.1 cated.

A T f I missing am "w as;

reihwmg iba haii-.M

'the

is tem mmf" adda@ ie mein hed. l

lerstr ally, QW, p] 1 a fi i) nes E?? um .Ling of The 00m ecol'd groove.

m'usjon mi? Sliem 1v portion G. materna C 1 ay au@ of the ciers the um hummm inv Ed www vb @they wm maier can* ben beating the 'tablet soften the recordreeeiving material, and impressing sounclrecord matrix therein.

' 2, The method of liiz'inufzzeturing eounel. record fza'blets with a, reeordfreeeiving surface ating of Suitable fiber-Containing record ninterial, consisting in ,Brei applying e solu tion or emulsion of suitble record receiving; maeriel free roin'ber Acontaining recim nonerizil7 inlV inem applying librerie inzie rial izo lierseme before che solvent has emporeel.

ln flieprorlne'ion of sound record tablets, rs providing' :i suitableinblet bix-se or undezsiruc'bure, then applying thereto a coating of Solmion or-'emulsion of suitable record material free 'from lnsus iterial, and tliexrnpplying to' ille ,said eenling suit able record imiter-lillA eonljnining brous'meterinl, said fiber-containing record material being in dry powdered forinand applied'be fore che Solvent of the irsi named eoeing has evaporated.

4. The method of producing sound record eblet blanks eonsisingT in irs eenling' the basic portion of be tablet with zin eilliesive and then applying powdereo record material containing-@irons material who Seid adhesive While the lnter is; in .condition 'io bind tbe powdered material io @the base.

5. The metliocl of producing sound reonblets eonsisfing of coating' elle basic portion of die tablet with n liin solution emulsion of record material, then *while lie livret Coating.,Y ie siil Wet applying bro'us 'material and ben applying another coating composed of zi thin soluion or eni-nleion of reoorcl nifieriel.

6. The metliofl of producing; a sound reeoral iiblet blank eonsissinff; in Coating a gibrous base with n thin Solution or emulsion of en adhesive suitable for use in gramoV phone or disk record te'olets @nel then apply-- ing fibrous reeorilmaterinl in e, loose See o such coating while the lzier is in eondition to cement lie zippliel fibrous material to the' l'ibrous bese. v

7. The method of 'producing' sound recorfl table?, blanks consisinfg in eoeinf; n, fibrous base with i1y tni'n Selur-ion or emulsion of nen-brons record materiel and lie-n emilying io seifl soaring berore the solvent has evapomtefln po'wflererl reeorflefeeeiving ninterinl containing fibrous nieerinl.

8. The metlioil of produeing sound reeonl nblei: blanks consist-ing in eonii'ie; a iiroiis base 1, v'ith ay thin solurion or emulsion of no' fibrous record nirrerizil and lien appl), seid coating 'before the solvent, ons raeil a powdered recorelqeeeiving containing' fibrous inaieeriel, and then.: iplying another coating of :i liin soluioY i emulsion of e nofrlibrons reeorfl-re niezerial,

il The meloe off pro-using sormc'i recoml 'tablet blanks eoneisting in producing upon a Sized disk of broue material, coalii'ig of :i liin solution or emulsion oli noirfibrone recoral-receiviing niaferiel, and lien emily ing to lie een eozi'irf; i pon/ele ed record material containing lib ons materiel, before the solvent of lle initial coating oratori. I

l0. Th,-

' sonni? reeofliieing n tion or emulsion of non-normes reeorfl nmerial 'oleo Capable of soening under l'seal? -rliien prolneing upon 'the Seial een 1i, of "ehe e und beore 'the sol reel, anolier Coming of' powder i r', ;l materiel eonemingg lilrone nineriel, nel last ,ined refiero 1 bein "i eoening nn"er been l2. The ineelioe' of precizeing eonnr ord ablet blanks consi mg in orrnn base of fibrous laterizi infila :we resin, producing thereupon e e thin solnti or emulsion. non-5l ord-receiving niet@ Ll, eepzible, elry,

of soie ing nncler been, `prodneing upon Suid soaring While sill containing solvent, m5

e eoaing formed of powdered reeorfl meieiial oonteining i'ilirons imterizil, Snif; lasl i'rnmefl record nmieriel being ivlierino-plasie and finally proilieingf upon the ooe-'Zing of powderzgezl record material another com* n, thin solu'ion or emulsion of the nmlerizil likelie, elle first-niinee con u i3. The mehoil of produeing' Sound ref*- oril zililee ci ieisszing in first proieein e basic disk of fibrous nnreriel i i' resin, proflneine' "'liereipon e combing fron? f liin solution or nieien of n reeorL-rece@ V1k Y nmterie; @nimble when Gly o seiten j; nner applying eind contini@ inline still oonainiin Solvent, a layer of fibrous 3o hernie-pizzerie reeorfl -reeeiving ninveriel, lien producing upon a eer-:onli layer n. firil liiyer-eomposeil of ai thin soli. 'ion or emul- Sion of reeorcl-reeei1 mere/rial like 'lie .'ii.'et-namefl lar i'j ilien lin/*ing lie feole 2.25 ll ink forn'ieii enel i lie-ailing l.. e

ferrie-l eher( sono@ record n' isliereby sofenee 

